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    //! Crate name parsing.

    use anyhow::Context as _;

    use super::Dependency;
    use crate::util::toml_mut::dependency::RegistrySource;
    use crate::util_schemas::manifest::PackageName;
    use crate::CargoResult;

    /// User-specified crate
    ///
    /// This can be a
    /// - Name (e.g. `docopt`)
    /// - Name and a version req (e.g. `docopt@^0.8`)
    #[derive(Debug)]
    pub struct CrateSpec {
        /// Crate name
        name: String,
        /// Optional version requirement
        version_req: Option<String>,
    }

    impl CrateSpec {
        /// Convert a string to a `Crate`
        pub fn resolve(pkg_id: &str) -> CargoResult<Self> {
            let (name, version) = pkg_id
                .split_once('@')
                .map(|(n, v)| (n, Some(v)))
                .unwrap_or((pkg_id, None));

            PackageName::new(name)?;

            if let Some(version) = version {
                semver::VersionReq::parse(version)
                    .with_context(|| format!("invalid version requirement `{version}`"))?;
            }

            let id = Self {
                name: name.to_owned(),
                version_req: version.map(|s| s.to_owned()),
            };

            Ok(id)
        }

        /// Generate a dependency entry for this crate specifier
        pub fn to_dependency(&self) -> CargoResult<Dependency> {
            let mut dep = Dependency::new(self.name());
            if let Some(version_req) = self.version_req() {
                dep = dep.set_source(RegistrySource::new(version_req));
            }
            Ok(dep)
        }

        pub fn name(&self) -> &str {
            &self.name
        }

        pub fn version_req(&self) -> Option<&str> {
            self.version_req.as_deref()
        }
    }